Finally got RKLogoEdit to work. Managed to create a .lst Script for 220x176 screen sizes using Windows Notepad.
I must say that RKLogoEdit looks a lot more promising now, it is capeable of modifying all the graphics including tiny battery icons and the moving visual effects.
With RKLogoEdit all you need to do is load the firmware in first and then load in the script, and have a play. You can also extract the bitmaps from various firmwares if you see something that takes your fancy.
When adding new pictures to your own firmware you dont even need to have the correct size image, RKLogoEdit will prompt you and rescale automatically.
RKLogoEdit